The fate of the onychophoran antenna
The fate of the onychophoran antenna
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DOI：
10.1007/s00427-013-0436-x
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发表时间：
2013-07-01
影响因子：
2.4
通讯作者：
Richter, Stefan
中科院分区：
文献类型：
--
作者：
Frase, Thomas;Richter, Stefan
最近的基因表达数据表明，有甲触角所在的区域对应于节肢动物头部最前面、明显无附肢的区域。有甲触角（或任何类似附属物的前体），也称为主触角，的命运已经被广泛讨论，并且存在相互矛盾的观点，即这种最前面的非节段附属物要么产生节肢动物盂唇，要么产生在某些甲壳类动物中发现的所谓额丝。我们关于甲壳动物早期轴突发生的数据表明，即使在最早的胚胎中，在触角和触角神经发育之前，大脑的环口原基也显示出非常突出的神经，这些神经进入额叶丝器官（也称为腔感受器器官）。这种情况类似于有甲动物触角神经的发育，这使我们得出结论：额丝确实与主触角同源。额丝在甲壳类动物中似乎也比之前想象的更常见，从而消除了从主触角转变为实验室的复杂场景的需要。
Recent gene expression data suggest that the region on which the onychophoran antenna is situated corresponds to the anteriormost, apparently appendage-less region of the arthropod head. The fate of the onychophoran antenna (or any appendage-like precursor), also called the primary antenna, has been discussed intensively, and there are conflicting suggestions that this anteriormost non-segmental appendage gave rise either to the arthropod labrum or, alternatively, to the so-called frontal filaments found in certain crustaceans. Our data on early axogenesis in anostracan crustaceans show that even in the earliest embryos, before the antennula and antennal nerves are developed, the circumoral anlagen of the brain display very prominent nerves which run into the frontal filament organ (also known as the cavity receptor organ). This situation resembles the development of the antennal nerves in onychophorans, which leads us to conclude that the frontal filaments are indeed homologous to the primary antenna. Frontal filaments also appear to be more common in crustaceans than previously thought, removing the need for a complicated scenario of transformation from a primary antenna into the labrum.